Cauldron Ferm has turned the bugs into non-stop lines

Cauldron Ferm has an unexpected story to begin with, as beginners go. Its core technology can be traced back to the 1960s, or perhaps the 1970s. The actual beginning is a little darker, actually. What is known is that David and Polly McLennan had a dream to feed the world using protein produced from microorganisms.

The two knew they needed to improve the process, which was expensive and time-consuming. Most of the burning takes place in groups. Compare a brewery or a vineyard. The ingredients go in and the bacteria work for a while, but the process stops when it’s time to release the finished product. It works for beer because beer commands a higher price. But the food? This should be cheap.

However, the McLennans persevered, starting a small business that 40 years later would perfect their continuous brewing process, which turns viruses into assembly lines that can produce uninterrupted production.

“We didn’t know what we had,” Michele Stansfied, co-founder and CEO of Cauldron Fermhe told TechCrunch. But in the end, Stansfield who arrived at the McLennans company in 2012, realized that he had more than he thought at first.

“We didn’t understand the problem with the continuous fermentation of synthetic biology,” Stansfield said. But when he did, he tried to transform the company into a more cost-effective one. “At that time, I raised the seed and got the IP, the property, and the business.”

Cauldron has now raised $13.25 million in a Series A2 round led by Main Sequence Ventures with participation from Horizons Ventures, NGS Super, and SOSV, the company told TechCrunch. They had already raised $6.5 million in 2024. Cauldron plans to use the money to “expand the technology moat,” Stansfield said.

The company calls its technology “hyper fermentation,” which allows microorganisms to produce more efficiently. It can work in existing covers with a few modifications to fit the job. Cauldron’s customers bring their own viruses and problems, and the startup works to modify their growing environment, including nutrition, to keep them humming.

Right now, Cauldron is focusing on making fats and proteins, including whey protein, “something that can go into the metal,” Stansfield said, though he adds that the company has many products in its pipeline.

“Sixty percent of all the things that contribute to the global economy can be made from biology,” he said. “Food is where we started, but now we’re diversifying.”